A5 hour and 25-minute flight begins at 9: 40 at what time will it end

Your answer is 3:05.

 You must add on to 9:40. So what I did was 9 + 5 = 14.
14 - 12 = 2.
So far it's 2:40.
25 minutes + 40. = 65.
Well there are 60 minutes in an hours. So 65 would be equal to 1H and 5min.
Now take that 1 hour. Add it to 2.
3 hours. And take your 5 minutes.
There! 3:05

Departure 9:40; flight duration 5:25 (all are hours: minutes)
Add up:
9:40
5:25

14:65 14 hours and 65 minutes, but 65 minutes = 1 hour + 5 minutes, so the arrival time is 15 hours and 5 minutes which is equal to 3 h and 5 min PM